First I was "wait, this is a Spike?? How did I die??" and kept dying around that area and like 2 minutes later I realized I had to activate the mask. I'd suggest a short text on the first screen "E to activate the spirit mask" because I see a lot of people (like myself) confused by it.
Other than that, it's a good puzzle platformer, the art is beautiful, nice tileset, the character reminds me of the old castlevania like graphics. Really nostalgic, good job!
